WARSAW, Poland — UEFA has fined the Russian soccer association $150,000 after its fans attacked stadium stewards at a European Championship match.

UEFA says Russia could be deducted six points in its Euro 2016 qualifying group for a repeat offense. The probationary period expires at the end of Euro 2016 qualifying.

Russian fans were filmed fighting with stadium staff in Wroclaw after a 4-1 win over the Czech Republic last Friday. Police said violence flared when stewards tried to detain a man they believed threw a firecracker.

Russia’s fine was also imposed for the thrown firework and because fans displayed nationalist flags.

UEFA rules hold soccer associations responsible for their fans’ behavior inside stadiums.